Filtering between frequency range

I have a matrix of 48X25600 in size. Each row depicts the signal amplitudes at 200 Hz.

I want to filter each row between a particular frequency band (0.05 - 01)Hz.

How do I do it?

Answer 1

[Star Strider]

The function you use depends on how you want to filter them. The filtering functions (includijng filtfilt) operate column-wise (i.e. each column is a different signal), so the filter a matrix row-wise, it will be necessary to do a simple transpose (the .' operator) first.

After that, use either:

y = bandpass(x, [0.05 0.1], Fs, 'ImpulseResponse','iir');

or:

y = bandstop(x, [0.05 0.1], Fs, 'ImpulseResponse','iir');

where ‘Fs’ is the sampling frequency (that I assume is 200 Hz), and ‘x’ is the matrix of signals after transposition.

Transpose the ‘y’ results to put them back in the same orientation as the input matrix ‘x’, if necessary.

See the documentation for bandpass and bandstop for details.

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